tag:blogger.com,1999:blog-7396057548824140336.comments2023-07-31T22:42:16.719-07:00WA0UWH - Electronics & HAM Radio BlogEldon R. Brown SRhttp://www.blogger.com/profile/16271671761017534867noreply@blogger.comBlogger314125tag:blogger.com,1999:blog-7396057548824140336.post-40172235803763497402017-09-01T03:02:50.526-07:002017-09-01T03:02:50.526-07:00It is SO Nice to see your efforts on mixers, Eldon...It is SO Nice to see your efforts on mixers, Eldon.Especially your idea to use marker pen to pre-color the enameled wire and make bi (tri)-fillar.Lovely really.<br /> Incidentally we also use BAT54S from NXP and many others. <br />BTW, did you come across any binocular core similar to one found in SBL-1 etc.<br /> I tried to test one and found the material could be 75 grade. If we can get some blank cores we can reduce the size of mixer .<br />For information the winding of 8 turns or so on sbl gave 363 uH. it is 10 times greater than toroids wounds on FT37-43.<br /><br /> Many thanks and wish you more of success in your experiments.<br /> regards<br /> 73s<br /><br />sarma<br /> vu3zmv<br /> <br /> <br /><br /> sarmahttps://www.blogger.com/profile/00092499384791602292noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-47051629311799217042016-12-04T14:41:42.019-08:002016-12-04T14:41:42.019-08:00Great looking shelves.
My Tek 475 is getting weird...Great looking shelves.<br />My Tek 475 is getting weird after sitting for a few months also. I had some 464's that the Florida weather seemed to kill too. Went through and cleaned all the connectors and replaced all the electrolytics and they worked fine. Test equipment seems to make the old 'use it or loose it' expression become true all too often.<br />73,<br />BillAI4WMhttps://www.blogger.com/profile/15961271286362136067noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-68991252325857305522016-11-20T11:47:03.866-08:002016-11-20T11:47:03.866-08:00Hi, I am very interested use and develope this sup...Hi, I am very interested use and develope this super start code !!!<br />thanks to send me github Anonymoushttps://www.blogger.com/profile/02143869759891692392noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-65434135828721115112016-09-29T05:04:54.756-07:002016-09-29T05:04:54.756-07:00Hi there, do you have the link to your code. I'...Hi there, do you have the link to your code. I'm interested to know how you displayed the battery and uptime details.AussieUserhttps://www.blogger.com/profile/09729583272309092151noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-64311252817840547982016-06-13T15:09:08.136-07:002016-06-13T15:09:08.136-07:00As a FYI, Teflon cold flows under pressure. Milita...As a FYI, Teflon cold flows under pressure. Military aircraft have teflon insulation with an additional outer layer of a material that does not cold flow for the "just In case" time a wire maybe pressed up against a metal contact.<br /><br />With constant oil pressure you may have an issue, hopefully it will not deform enough to be swallowed by the engine. I to have a 6.0 but no issues yet....just taking longer to start when warm vs cold. I suspect HP seal leaks.<br /><br />Hot shot secret cleared up a lot of injector stiction for me. <br /><br />Good luck<br /><br />Ken<br /><br />K1KLWAnonymoushttps://www.blogger.com/profile/08187147717665029062noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-5655007285731840672016-05-27T09:12:01.128-07:002016-05-27T09:12:01.128-07:00Thanks Greg, for the interesting updates of your p...Thanks Greg, for the interesting updates of your project and the use with the counter. I may revisit this circuit to do something similar. Eldon R. Brown SRhttps://www.blogger.com/profile/16271671761017534867noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-88702100901251873942016-05-27T09:06:05.001-07:002016-05-27T09:06:05.001-07:00Thanks Greg, for the interesting updates of your p...Thanks Greg, for the interesting updates of your project and the use with the counter. I may revisit this circuit to do something similar. Eldon R. Brown SRhttps://www.blogger.com/profile/16271671761017534867noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-27285113253920527652016-05-27T07:29:06.082-07:002016-05-27T07:29:06.082-07:00Greg Morris here again (as unknown, above).
I cont...Greg Morris here again (as unknown, above).<br />I continued tweaking the circuit, using an air-variable cap for C6, and using one of the Radio Shack 9V pocket amplifiers (based on the LM386) at the output of the on-board LM386 to really boost the audio. One possible improvement would be to use the leftover transistor in the CA3146E (or equiv.) as a preamp, so the unit doesn’t require an external amplifier.<br />I am getting much better results. The LO output *does* track the received station, as described by Nick (see link in article). I can usually hear WWV or WWVH, sometimes both at the same time. I was able to use the LO output to also tweak my home-built ARRL frequency counter (needed more localized supply filtering) and so now I have achieved the goals I set out to accomplish with this unit. I more than doubled the sensitivity of the frequency counter 10 MHz front-end, improved the stability of the 550 MHz front-end, and got it calibrated within a Hertz or two.Unknownhttps://www.blogger.com/profile/04123001715702917691noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-70215713858246583362016-05-18T21:21:01.639-07:002016-05-18T21:21:01.639-07:00I found this autodyne circuit a couple of weeks ag...I found this autodyne circuit a couple of weeks ago. I've been looking for a reasonably-accurate frequency reference to calibrate my frequency counter. I had a PCB made, and put it together. My circuit uses a CA3146E which I found on eBay. I am using the original design by K7QO & VE3DNL, which can be found on the Brainwagon site.<br />I used a different L1 at first, and the oscillator would not run. Reducing the value of R1/10K fixed that, but I ended up adding a regulated 12V supply instead.<br />I can hear some beats at certain settings, but no modulation at all. This is with a 1/2 wavelength dipole through a commercial 300-75 ohm balun. Amplified LO output is 150mV-PP, not enough to trigger my 1989 ARRL Handbook frequency counter. So thus far it has been a total waste of time. If anyone else has suggestions for improvements, I'd love to hear 'em.Unknownhttps://www.blogger.com/profile/04123001715702917691noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-50294887519046339482016-03-16T15:35:11.576-07:002016-03-16T15:35:11.576-07:00Jerry, Eldon made a simple nomenclature error. He...Jerry, Eldon made a simple nomenclature error. He means MUA (mail user agent). Aside from that, he has implemented exactly what you suggest.<br />A "MTA client" is more properly known as MUA. You can see from the article below that every piece of software involved in email handling has "agent" in its designation. So, it actually is an agent.<br /><br />https://en.wikipedia.org/wiki/Message_transfer_agentMatthttps://www.blogger.com/profile/15025759511663852809noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-5789191368388977472016-03-13T18:46:34.151-07:002016-03-13T18:46:34.151-07:00Eldon, Outlook and Thunderbird are not MTA's. ...Eldon, Outlook and Thunderbird are not MTA's. They are MTA clients, which is what you need. These are just two possibilities. Every ISP I've ever used has it's own MTA which you can easily access with the appropriate commands.<br />I think you are very confused as to what a MTA is vs. a mail client. An MTA client is not an email agent.<br />Over the last 30+ years I've implemented a number of email clients. All of them have connected to an MTA. And many of them have also sent SMS texts.Jerrry, AI0Khttps://www.blogger.com/profile/16585415554042988042noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-35818485236555759872016-03-12T19:42:37.561-08:002016-03-12T19:42:37.561-08:00This is great, thanks for sharing. I added subjec...This is great, thanks for sharing. I added subject with this:<br /><br /><strong><br />if (_MTA(client, "Subject:" + aSubject + "\r\n\r\n" + aMesg + "\r\n.\r\n", "250 ", 10*SECs ) == false) break;<br /></strong>Matthttps://www.blogger.com/profile/15025759511663852809noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-51760065570624413112016-02-19T06:41:17.122-08:002016-02-19T06:41:17.122-08:00Hi Eldon, I've had a bit of a wrestle but didn...Hi Eldon, I've had a bit of a wrestle but didn't get it going. I did have a happy connection with the si570 with the 'standard' software. Sounds like that's the best starting point. Perhaps I can have a go with a local ham who is good with this kind of thing. Appreciate you time.<br /><br />AlexAnonymoushttps://www.blogger.com/profile/03403179248957975240noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-50578806521227638642016-02-15T02:00:24.483-08:002016-02-15T02:00:24.483-08:00thanks for sharing the code
raspberry pi boards i...thanks for sharing the code<br /><br /><a href="http://www.electronicsrus.com.au/raspberry-pi/raspberry-pi-boards.html" rel="nofollow">raspberry pi boards in australia</a>Anonymoushttps://www.blogger.com/profile/15959058719450332532noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-90769504786431723622016-02-12T04:26:18.068-08:002016-02-12T04:26:18.068-08:00Nice project. I have some Kinsten brand pre-sensit...Nice project. I have some Kinsten brand pre-sensitised PCBs I'm going to use for some RF projects (between 100 and 200 MHz) but I'm not sure exactly how I should select my trace dimensions.<br /><br />I was wondering how you decided on 6 mil traces with a hatched (6 mil lines?) fill? Did you calculate with a specific dielectric constant for your boards, did you use a standard fibre-glass value, or did you simply use a hobbyist standard?Dohzerhttps://www.blogger.com/profile/09027208738297757607noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-24736504526621647542016-02-11T13:45:40.758-08:002016-02-11T13:45:40.758-08:00I have not looked at the code for over a year, but...I have not looked at the code for over a year, but I think the current Rev is "KA01": see the GitHub. Do you have a working Si570 connected? Initiation will not continue without a connection. Sorry my memory of the software is not that current.Eldon R. Brown SRhttps://www.blogger.com/profile/16271671761017534867noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-32910469368816187982016-02-11T11:54:14.746-08:002016-02-11T11:54:14.746-08:00Evening Eldon,
I'm wrestling a bit with the c...Evening Eldon,<br /><br />I'm wrestling a bit with the code and could do with a bit of help please. If I enable an encoder (I have a standard EC11 type) and upload the code it goes through the initial Hello screen, then rev screen then hangs on Radiono0.4.erb and stays there until I power off. I have connected up an encoder and on turning it just resets the arduino. I know I'm missing something somewhere but I don't quite know what. Can you help?Anonymoushttps://www.blogger.com/profile/03403179248957975240noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-64976362240862848832016-02-09T21:23:36.164-08:002016-02-09T21:23:36.164-08:00You can also do this pretty easily with the nginx ...You can also do this pretty easily with the nginx webserver, with the added advantage that it is much more memory efficient.<br /><br />If you try nginx, pay attention to the buffering settings. For this application, an ideal configuration is for nginx to quickly buffer the entire response from the esp8266, and then serve it out to the client, eliminating any time/memory being occupied while serving the data to potentially slow clients.SB Dexterhttps://www.blogger.com/profile/03736719493349330598noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-78831818781124896082016-02-02T06:34:41.147-08:002016-02-02T06:34:41.147-08:00And this is how an infinite number of monkeys bang...And this is how an infinite number of monkeys banging on typewriters type out the Gettysburg Address ....Larry Littlefieldhttps://www.blogger.com/profile/09083659166631020929noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-57049796499752587312016-01-25T16:13:37.422-08:002016-01-25T16:13:37.422-08:00I have need of an AM receiver about the size of a ...I have need of an AM receiver about the size of a quarter or so and I am hoping for a 1.5 or maybe 3 volt supply requirement. Any ideas?thesafecathttps://www.blogger.com/profile/17590708503380252913noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-74339499381656266482016-01-21T12:54:29.014-08:002016-01-21T12:54:29.014-08:00I have now shared The Single Board Esp12 and Esp13...I have now shared The Single Board Esp12 and Esp13 Adapters on OshPark.Eldon R. Brown SRhttps://www.blogger.com/profile/16271671761017534867noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-46636786028194824332016-01-20T14:25:50.764-08:002016-01-20T14:25:50.764-08:00Great little project! I was going to order the ad...Great little project! I was going to order the adapters, but if you plan on having the sing board adapters shortly, maybe I'll hold off. Have an ETA?ChipStewarthttps://www.blogger.com/profile/11054060054235485844noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-49659637738573573422016-01-19T13:49:25.749-08:002016-01-19T13:49:25.749-08:00very coolvery coolGiohttps://www.blogger.com/profile/06921969515011520531noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-36784158152041631592016-01-13T00:21:23.935-08:002016-01-13T00:21:23.935-08:00Great work!
How did you make the oscilloscope to ...Great work!<br /><br />How did you make the oscilloscope to act like a spectrum analyzer?Anonymoushttps://www.blogger.com/profile/03719593499620217557noreply@blogger.comtag:blogger.com,1999:blog-7396057548824140336.post-54225116888094697812015-12-13T09:55:23.023-08:002015-12-13T09:55:23.023-08:00Very Good !!
I thought about using a "text&q...Very Good !!<br /><br />I thought about using a "text" function to generate the number, but wanted to continue with my use of a math function (and bc) to actually compute the value, see a previous post.<br /><br />Thanks.<br />Eldon - WA0UWHEldon R. Brown SRhttps://www.blogger.com/profile/16271671761017534867noreply@blogger.com